public async Task <string> ConvertAsync(string filePath)
{
var mediaInfo = FFmpeg.GetMediaInfo(filePath).Result;
IStream audioStream = mediaInfo.AudioStreams.FirstOrDefault()
?.SetCodec(AudioCodec.pcm_s16le)
?.SetChannels(1)
?.SetSampleRate(16000);
var outputPath = Path.ChangeExtension(Path.GetTempFileName(), ".wav");
await FFmpeg.Conversions.New().AddStream(audioStream).SetOutput(outputPath).Start();
VoskRecognizer rec = new VoskRecognizer(VoskAudioRecognizer.VoskModel, 16000.0f);
rec.SetMaxAlternatives(0);
rec.SetWords(true);
using (Stream source = File.OpenRead(outputPath))
{
byte[] buffer = new byte[4096];
int bytesRead;
while ((bytesRead = source.Read(buffer, 0, buffer.Length)) > 0)
{
rec.AcceptWaveform(buffer, bytesRead);
}
}
string text = rec.FinalResult();
;
return(JObject.Parse(text).Last.First.ToString());
}
public List <ResultText> TranscribeViaVosk(string waveFileName, string modelFileName)
{
Directory.SetCurrentDirectory(_voskFolder);
Vosk.Vosk.SetLogLevel(0);
if (_model == null)
{
labelProgress.Text = LanguageSettings.Current.AudioToText.LoadingVoskModel;
labelProgress.Refresh();
Application.DoEvents();
_model = new Model(modelFileName);
}
var rec = new VoskRecognizer(_model, 16000.0f);
rec.SetMaxAlternatives(0);
rec.SetWords(true);
var list = new List <ResultText>();
labelProgress.Text = LanguageSettings.Current.AudioToText.Transcribing;
labelProgress.Text = string.Format(LanguageSettings.Current.AudioToText.TranscribingXOfY, _batchFileNumber, listViewInputFiles.Items.Count);
labelProgress.Refresh();
Application.DoEvents();
var buffer = new byte[4096];
_bytesWavTotal = new FileInfo(waveFileName).Length;
_bytesWavRead = 0;
_startTicks = DateTime.UtcNow.Ticks;
timer1.Start();
using (var source = File.OpenRead(waveFileName))
{
int bytesRead;
while ((bytesRead = source.Read(buffer, 0, buffer.Length)) > 0)
{
_bytesWavRead += bytesRead;
if (rec.AcceptWaveform(buffer, bytesRead))
{
var res = rec.Result();
var results = ParseJsonToResult(res);
list.AddRange(results);
}
else
{
var res = rec.PartialResult();
textBoxLog.AppendText(res.RemoveChar('\r', '\n'));
}
if (_cancel)
{
TaskbarList.SetProgressState(_parentForm.Handle, TaskbarButtonProgressFlags.NoProgress);
return(null);
}
}
}
var finalResult = rec.FinalResult();
var finalResults = ParseJsonToResult(finalResult);
list.AddRange(finalResults);
timer1.Stop();
return(list);
}
public static void DemoBytes(Model model)
{
// Demo byte buffer
VoskRecognizer rec = new VoskRecognizer(model, 16000.0f);
rec.SetMaxAlternatives(0);
rec.SetWords(true);
using (Stream source = File.OpenRead("test.wav")) {
byte[] buffer = new byte[4096];
int bytesRead;
while ((bytesRead = source.Read(buffer, 0, buffer.Length)) > 0)
{
if (rec.AcceptWaveform(buffer, bytesRead))
{
Console.WriteLine(rec.Result());
}
else
{
Console.WriteLine(rec.PartialResult());
}
}
}
Console.WriteLine(rec.FinalResult());
}